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They might be drawing continuously without needing to. This can tax the GPU. So it can be because of poor optimization.
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KasperHviid: Hello, I'm back in the thread now! msi afterburner looks like a fine prog - thanks for pointing this out. Can you tell a bit about how I use it, if I want to limit framerate? Can it also limit the games CPU usage?
Once it is running there is a second icon in the taskbar called rivatuner, there you can set the framerate.

You can limit the CPU with a windows power plan. I have one of those for Eador: Genesis, it does not run properly with full CPU.Power settings can be linked to the desktop and activated with 3 or 4 clicks.